Just changed the oil in my jeep, rebuilt 360 with 70K miles. I noticed that when I start the engine, even when it's warm the oil pressure is really low for several seconds then goes up to normal pressure. It didn't do this before. I used 10-40, too heavy?

Dion, I'm pretty sure the oil is not the problem - are you sure you have the correct oil filter? It's been a while since I worked on an AMC but I believe the oil filter has a check valve in it to prevent the oil from draining back to the pan. If there is no check valve, the oil filter has to fill before oil can reach the gauge (this applies whether the gauge is manual or electric) causing a delay in the gauge reading. I've understand there are "off-shore" filters that are really poor quality. Hope this helps you ....... Dennis58

I had that problem especialy in winter with my 350 and after reading up on filters, selected the Napa Gold filter with the Anti-drainback valve. Oil pressure starts building with the first fire of the engine. Another of my car's (an 03 GP V-6) used to rattle bad on first start in the morning when it started and ran straight to fast idle and made me sick to hear it. Switching from fram to Napa Gold solved that problem also. 10-40 should not be a problem in SD. I was born and raised there and know the weather.

Thanks guys. That could be it. I had a Napa filter #21522 in there but didn't know about the check valve and bought a filter from Car Quest. I'll try a Napa filter in there tomorrow and see what happens.

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